order by
The keyword order by is used to sort the result based on specified column(s).
Starting from version 1.30.17/2.00.5, the order-by column can be a selected column or its alias.
Starting from version 1.30.21/2.00.9, order by supports nulls first/nulls last:
$ order by col [asc | desc] [nulls first | nulls last]
asc | desc
specifies that the results should be returned in ascending order or descending order. If the order is not specified, ASC is the default.
nulls first | nulls last
Specifies that NULL values should be returned before or after non-NULL values.
Examples
$ sym = `C`MS`MS`MS`IBM`IBM`C`C`C$SYMBOL
$ price= 49.6 29.46 29.52 30.02 174.97 175.23 50.76 50.32 51.29
$ qty = 2200 1900 2100 3200 6800 5400 1300 2500 8800
$ timestamp = [09:34:07,09:36:42,09:36:51,09:36:59,09:32:47,09:35:26,09:34:16,09:34:26,09:38:12]
$ t1 = table(timestamp, sym, qty, price);
$ t1;
timestamp |
sym |
qty |
price |
---|---|---|---|
09:34:07 |
C |
2200 |
49.6 |
09:36:42 |
MS |
1900 |
29.46 |
09:36:51 |
MS |
2100 |
29.52 |
09:36:59 |
MS |
3200 |
30.02 |
09:32:47 |
IBM |
6800 |
174.97 |
09:35:26 |
IBM |
5400 |
175.23 |
09:34:16 |
C |
1300 |
50.76 |
09:34:26 |
C |
2500 |
50.32 |
09:38:12 |
C |
8800 |
51.29 |
select * from t1 order by sym, timestamp;
timestamp |
sym |
qty |
price |
---|---|---|---|
09:34:07 |
C |
2200 |
49.6 |
09:34:16 |
C |
1300 |
50.76 |
09:34:26 |
C |
2500 |
50.32 |
09:38:12 |
C |
8800 |
51.29 |
09:32:47 |
IBM |
6800 |
174.97 |
09:35:26 |
IBM |
5400 |
175.23 |
09:36:42 |
MS |
1900 |
29.46 |
09:36:51 |
MS |
2100 |
29.52 |
09:36:59 |
MS |
3200 |
30.02 |
We can use keyword “desc” to sort on descending order.
select * from t1 where sym in `C`IBM order by sym, timestamp desc;
timestamp |
sym |
qty |
price |
---|---|---|---|
09:38:12 |
C |
8800 |
51.29 |
09:34:26 |
C |
2500 |
50.32 |
09:34:16 |
C |
1300 |
50.76 |
09:34:07 |
C |
2200 |
49.6 |
09:35:26 |
IBM |
5400 |
175.23 |
09:32:47 |
IBM |
6800 |
174.97 |
t = table(5 3 NULL NULL 1 6 8 as id, 1 2 3 4 5 6 7 as val)
select * from t order by id asc nulls last
id |
val |
---|---|
1 |
5 |
3 |
2 |
5 |
1 |
6 |
6 |
8 |
7 |
3 |
|
4 |
t = table(5 3 NULL NULL 1 6 8 as id, 1 2 3 4 5 6 7 as val)
select * from t order by id asc nulls first
id |
val |
---|---|
3 |
|
4 |
|
1 |
5 |
3 |
2 |
5 |
1 |
6 |
6 |
8 |
7 |